15.4.3.1   Wooden shipping packages
Lumber is a hygroscopic packaging material. Air dry lumber is considered container dry if its equilibrium moisture content is 70 - 75%, i.e. its water content is 12 - 15%.
 
It very often happens that cases are made from lumber which is too green and thus too wet (water content > 15%), resulting in the growth of mold on fruit and vegetables, for example.
 

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